What is the motive for going to the Gregg house?

While they wonder who could have found out about them and what it would ultimately mean, Julie and Ray continually revisit the events and their feelings of guilt. Ray even goes so far as to tell Barry he wants to break the pact. Barry refuses to allow it. They go to the Gregg house to see if they can learn anything there. They learn that they wrecked a whole family and not just one little boy.